Too little too late now that the new meta is to use system provided webviews so you don't have to ship a big ass web renderer per app.
No particular reason Servo couldn't one day become the system web view on Linux distros...
That is not the meta. The meta is to ship blink so you only have to support a single version of a single web engine in stead of many versions of many different web engines.
System web views were available as drag and drop components in VB6 two and a half decades ago. There's nothing "new" about that as a concept, and plenty of reasons to not want to use Blink/WebKit.